Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c0338df944e7f3…

MALICIOUS

PDF

68.1 KB Created: 2021-10-01 07:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e259be3c9c728598951ff5de8ec7e38d SHA-1: 5355d67c7fe70c8d5a13e03dab5863c8207f2ffc SHA-256: 54c0338df944e7f3c571bd39df0e45bc8ee5fc3eab9fbcf2ee8bb7bfc321279a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by an ML classifier as malicious. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a redirection or phishing attempt. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://wastran.ru/uplcv?utm_term=how+to+access+vcard+on+android PDF link annotation
    • http://soepcentrale-dekeyser.be/userfiles/file/detiwosuk.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/690abc9df2528e03f220996c17f2b064/mevuxamiratunopufujeva.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/kilajuvabukixevexogevaxu.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/mukonifu.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/tofutisigo.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/nonaziviw.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/8997996909.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/xoxukiveparojopimivozimav.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/70522667904.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaac412ee4---vedisasijuwo.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/navut.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/67521887726.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/jizab.pdfIn PDF document text
    • http://aven.su/userfiles/file/lonuzamugonunajupa.pdfIn PDF document text
    • http://wohingltd.com/userfiles/61368704945.pdfIn PDF document text
    • http://asqcert.net/files/files/83300098156.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/41833416121.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/94610592579.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/29488445671.pdfIn PDF document text
    • http://twilaw.com/files/files/revejasibodis.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/mesemij.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/5919054170.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/wavomemuwob.pdfIn PDF document text
    • http://10playsolutions.com/clients/softklk/documents/_articles_/file/kuturegekipimes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 14508 bytes
SHA-256: 8de77e0d893e45540f41ad8d39dcaca393f24ab8fa1d40276b7bcb7686488b5b
font_02_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 10460 bytes
SHA-256: 66a421a1d234d0c878c95f31fe858e130f4dc11b9d9b03de6934db6a70ad2dc6

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